Three Levels Describe the Same Solution Chemists describe one solution at three levels, and this topic is about moving between them. The macroscopic level is what you can observe: a clear liquid, a blue colour, an undissolved solid. The symbolic level is formulas and equations, such as NaCl(s) → Na⁺(aq) + Cl⁻(aq), where (aq) means … Read more
How to Use This Worksheet Work through the sections in order. Section A checks the vocabulary of mixtures and the particulate picture of a solution, Section B builds fluency with molarity, ion counting, dilution and mixing, and Section C combines them in exam style. Keep two questions separate throughout: how much solute is present, and … Read more
Mixtures: Variable Composition, Uniform When Dissolved A mixture holds two or more substances physically combined, each keeping its own identity. Unlike a compound, whose elements sit in a fixed mass ratio, its composition varies freely with how much of each component was added. A homogeneous mixture has the same composition and properties throughout. A solution … Read more
How to Use This Worksheet Work through the sections in order. Section A checks the two ideal assumptions that fail, Section B builds fluency with the compressibility factor and free volume, and Section C mixes conditions, gases and data in exam style. Name the dominant effect, attractions or particle volume, before stating any direction. Do … Read more
Two Postulates Fail, Each in Its Own Conditions The ideal gas law, PV = nRT, rests on two simplifications: particles occupy no volume, and they exert no forces on each other. Real particles fail both, and every deviation here traces back to one or the other. The volume failure grows as particles are forced closer … Read more
How to Use This Worksheet Work through the sections in order. Section A checks the postulates and the reading of Maxwell-Boltzmann curves, Section B builds fluency with average kinetic energy, root-mean-square speeds and Graham’s law, and Section C mixes everything in exam style. Two habits carry the whole topic: temperature goes into every formula in … Read more
The Model: Five Postulates Kinetic molecular theory explains the macroscopic properties of gases through the motion of their particles. It rests on five postulates. Particles are points. Their own volume is negligible beside the container’s: nearly all of a gas is empty space. Particles move constantly and randomly. They travel in straight lines until they … Read more
How to Use This Worksheet Work through the sections in order. Section A checks the ideas, Section B builds fluency with the ideal gas equation, the combined gas law, partial pressures and density, and Section C mixes everything in exam style. Two habits carry the whole topic: convert temperature to kelvin before anything else, and … Read more
Four Variables, One Equation A sample of gas is completely described by four macroscopic variables: pressure (P), the force per unit area from particles colliding with the walls; volume (V), the space the gas fills, which is the container’s volume; temperature (T); and amount (n), in moles. The ideal gas law ties them together: PV … Read more
How to Use This Worksheet Work through the sections in order. Section A checks the ideas, Section B builds fluency with spacing, vapour pressure and boiling data, and Section C mixes everything in exam style. One habit carries the whole topic: for any property, settle the spacing, the motion, and who is winning, kinetic energy … Read more